400 error “failedPrecondition”

Replies: 0

Any suggestions for a solution to this error?

Versions:
WordPress: 4.9.6
WordPress MS: No
PHP: 5.6.30
WP Mail SMTP: 1.2.5

Params:
Mailer: gmail
Constants: No
Client ID/Secret: Yes
Auth Code: Yes
Access Token: Yes

Server:
OpenSSL: Yes
PHP.allow_url_fopen: Yes
PHP.stream_socket_client(): Yes
PHP.fsockopen(): Yes
PHP.curl_version(): Yes

Debug:
Error while sending via Gmail mailer: {
“error”: {
“errors”: [
{
“domain”: “global”,
“reason”: “failedPrecondition”,
“message”: “Mail service not enabled”
}
],
“code”: 400,
“message”: “Mail service not enabled”
}
}